【简答题】【 Word meaning 】 Choose the underlined words ’ meanings in the following sentences. (1) “ Self-reliance ” has influenced the way I view the world and myself. A. 自立 B. 自尊 C. 自信 D. 自爱 (2) It concentrate...
【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.
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.
【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...
【单选题】关于浸渍法下列叙述错误的是
C.
适用于有效成分能溶于水,且对湿、热较稳定的药材
【简答题】Na 3 AlF 6 不溶于水,可用作胃毒性和触杀性杀虫剂,搪瓷乳白剂、树脂橡胶的耐磨填充剂,并广泛应用于铝的冶炼。工业上生产Na 3 AlF 6 的流程如下 试结合生产流程回答下列问题 (1)煅烧时总反应的化学方程式为____________________。 (2)煅烧后的固体在浸取前进行粉碎的目的是____________,为达到相同目的,常温浸取时还可采取的措施是____________。...
【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
【简答题】交际应用 A: Oh. Jim! Be careful! You almost fell down. 11 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 th...
【简答题】在利润平均化的过程中,银行资本家得到()。