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【单选题】
数字式电压表的核心是( )A.
数字逻辑控制电路
B.
AD转换器
C.
显示器
D.
比较器
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举一反三
【单选题】The following statements have been made about price elasticity of demand. When sales demand is inelastic, a company can increase profits by raising the selling price of its product. Price elasticity o...
A.
1 only
B.
2 only
C.
Neither 1 nor 2
D.
Both 1 and 2
【单选题】Jack is leading a poor life and the bed is the only thing is valuable in his room.
A.
what
B.
of which
C.
which
D.
that
【简答题】请说明典型车载网络系统的组成
【单选题】三相电力变压器的容量是指在额定运行情况下( )。
A.
三相中任一相输出的视在功率
B.
三相输出视在功率的总和
C.
三相任一相输出的有功功率
D.
三相输出有功功率的总和
【单选题】―_________________? ―She looks tall and beautiful.
A.
What does Gong Li look like
B.
Who’s Gong Li
C.
What is Gong Li
D.
What do you like Gong Li
【多选题】下列关于原子吸收法操作描述正确的是()。
A.
打开灯电源开关后,应慢慢将电流调至规定值
B.
空心阴极灯如长期搁置不用,将会因漏气、气体吸附等原因而不能正常使用,甚至不能点燃,所以,每隔3-4个月,应将不常用的灯通电点燃2-3小时,以保持灯的性能并延长其使用寿命
C.
取放或装卸空心阴极灯时,应拿灯座,不要拿灯管,更不要碰灯的石英窗口,以防止灯管破裂或窗口被沾污,异致光能量下降
D.
空心阴极灯一旦打碎,阴极物质暴露在外面,为了防止阴极材料上的某些有害元素影响人体健康,应按规定对有害材料进行处理,切勿随便乱丢
【简答题】Sports account for a growing amount of income made on the sales of commercial time by television companies. Many television companies have used sports to attract viewers from particular sections of t...
【单选题】( ) define the conditions under which the seller and buyer agree to settle the financial amount of the sales contract.
A.
Terms of payment
B.
Methods of payment
C.
Place of payment
D.
Time of payment
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