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【简答题】
若某电源开路电压为120V,移除电源后,网络两端等效电阻为60Ω,则负载从该电源获得的最大功率是()。
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举一反三
【简答题】A. Children should be taught to be more careful. B. Children shouldn't drink so much orange juice. C. There is no need for the man to make such a fuss. D. Timmy should learn to do things in the right ...
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【单选题】You are really curious about chemistry and chemical reactions. You wonder what would happen if you mixed chemicals in a different way or introduced something new into a procedure. You should:
A.
Stomp that curiosity down. Chemists do what they are told. Nothing more, nothing less.
B.
Run with it.
C.
Get the
D.
Be applauded for your curiosity, imagination, and quest for innovation, but be very, very careful about altering procedures. If it's a lab experiment for a grade, don't deviate from the procedure. Otherwise, make a prediction about what could happen based on your observations. Research possible reactions and consequences before playing mix-and-match in the lab.
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【单选题】在焙烧温度低于烧结范围,得到的色浅、敲击时音哑、孔隙率大、强度低、吸水率大、耐久性差的砖,叫做()
A.
适火砖
B.
欠火砖
C.
过火砖
D.
柴火砖
查看完整题目与答案
【单选题】下列不是常用的浸取溶剂的是（ ）
A.
乙醇
B.
乙酸
C.
水
D.
丙酮
查看完整题目与答案
【简答题】(A) A: Oh. Jim! Be careful! You almost fell down. 1 1 B: Don't worry. I'm OK. A : 12 B: OK. I won't. A: By the way, 13 B: Haha. You saw my pictures in the friend circle! A: Yeah. I'm used to looking t...
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【单选题】关于浸渍法下列叙述错误的是
A.
提取温度不同可分为常温浸渍法和温浸法
B.
一般选用动态提取
C.
适用于有效成分能溶于水,且对湿、热较稳定的药材
D.
操作时间长,溶剂用量较大
查看完整题目与答案
【单选题】根据《中华人民共和国海关法》及《中华人民共和国进出口关税条例》的规定，纳税义务人应当在规定的时限内缴纳税款，逾期由海关征收滞纳金，这一规定的时限是（ ）。
A.
海关填发税款缴纳书之日起7日内(法定节假日除外)
B.
海关填发税款缴纳书次日起7日内(法定节假日除外)
C.
海关填发税款缴纳书之日起15日内(法定节假日除外)
D.
海关填发税款缴纳书次日起15日内(法定节假日除外)
查看完整题目与答案
【单选题】–-You should be _______ careful when you take the chemistry exam. ---I agree. In this way, I will make _______ mistakes.
A.
more; less
B.
more; more
C.
less; fewer
D.
more; fewer
查看完整题目与答案
【多选题】液 - 液提取 机磷农药中毒检材 法 , 是最常用的一种方法, 磨沙提取法 是 液 - 液提取法 的一种, 下列关于操作的描述不正确的是 。 ( )
A.
取胃内容、呕吐物、肝、肾等内脏组织检材(固态状检材需用手术剪剪碎)于研钵中
B.
加无水硫酸钠研磨至干沙状
C.
置于具塞三角烧瓶中
D.
用提取溶剂浸没检材，振摇提取２～3次
E.
合并提取液，待净化、浓缩、供检。
查看完整题目与答案
【单选题】–You should be _______ careful when you take the chemistry exam. --I agree. In this way, I will make _______ mistakes.
A.
more; less
B.
more; more
C.
more; fewer
D.
less; fewer
查看完整题目与答案
相关题目：
【简答题】A. Children should be taught to be more careful. B. Children shouldn't drink so much orange juice. C. There is no need for the man to make such a fuss. D. Timmy should learn to do things in the right ...
查看完整题目与答案
【单选题】You are really curious about chemistry and chemical reactions. You wonder what would happen if you mixed chemicals in a different way or introduced something new into a procedure. You should:
A.
Stomp that curiosity down. Chemists do what they are told. Nothing more, nothing less.
B.
Run with it.
C.
Get the
D.
Be applauded for your curiosity, imagination, and quest for innovation, but be very, very careful about altering procedures. If it's a lab experiment for a grade, don't deviate from the procedure. Otherwise, make a prediction about what could happen based on your observations. Research possible reactions and consequences before playing mix-and-match in the lab.
查看完整题目与答案
【单选题】在焙烧温度低于烧结范围,得到的色浅、敲击时音哑、孔隙率大、强度低、吸水率大、耐久性差的砖,叫做()
A.
适火砖
B.
欠火砖
C.
过火砖
D.
柴火砖
查看完整题目与答案
【单选题】下列不是常用的浸取溶剂的是（ ）
A.
乙醇
B.
乙酸
C.
水
D.
丙酮
查看完整题目与答案
【简答题】(A) A: Oh. Jim! Be careful! You almost fell down. 1 1 B: Don't worry. I'm OK. A : 12 B: OK. I won't. A: By the way, 13 B: Haha. You saw my pictures in the friend circle! A: Yeah. I'm used to looking t...
查看完整题目与答案
【单选题】关于浸渍法下列叙述错误的是
A.
提取温度不同可分为常温浸渍法和温浸法
B.
一般选用动态提取
C.
适用于有效成分能溶于水,且对湿、热较稳定的药材
D.
操作时间长,溶剂用量较大
查看完整题目与答案
【单选题】根据《中华人民共和国海关法》及《中华人民共和国进出口关税条例》的规定，纳税义务人应当在规定的时限内缴纳税款，逾期由海关征收滞纳金，这一规定的时限是（ ）。
A.
海关填发税款缴纳书之日起7日内(法定节假日除外)
B.
海关填发税款缴纳书次日起7日内(法定节假日除外)
C.
海关填发税款缴纳书之日起15日内(法定节假日除外)
D.
海关填发税款缴纳书次日起15日内(法定节假日除外)
查看完整题目与答案
【单选题】–-You should be _______ careful when you take the chemistry exam. ---I agree. In this way, I will make _______ mistakes.
A.
more; less
B.
more; more
C.
less; fewer
D.
more; fewer
查看完整题目与答案
【多选题】液 - 液提取 机磷农药中毒检材 法 , 是最常用的一种方法, 磨沙提取法 是 液 - 液提取法 的一种, 下列关于操作的描述不正确的是 。 ( )
A.
取胃内容、呕吐物、肝、肾等内脏组织检材(固态状检材需用手术剪剪碎)于研钵中
B.
加无水硫酸钠研磨至干沙状
C.
置于具塞三角烧瓶中
D.
用提取溶剂浸没检材，振摇提取２～3次
E.
合并提取液，待净化、浓缩、供检。
查看完整题目与答案
【单选题】–You should be _______ careful when you take the chemistry exam. --I agree. In this way, I will make _______ mistakes.
A.
more; less
B.
more; more
C.
more; fewer
D.
less; fewer
查看完整题目与答案
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