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【单选题】
下列实验操作正确的是（ ）A.
实验：除去碳酸氢钠粉末中的碳酸钠粉末； 操作：将固体混合物放入试管内，试管口稍低于试管底，固定台上，加热至不再有气体放出
B.
实验：配制一定物质的量浓度的氯化钾溶液； 操作：准确称取一定质量的氯化钾固体，放入到1000mL的容量瓶中，加水至1000mL溶解，振荡摇匀
C.
实验：稀释浓硫酸； 操作：将蒸馏水沿烧杯内壁慢慢注入盛浓硫酸的烧杯中，并用玻璃棒不断搅拌，使产生的热量不断散失
D.
实验：取出分液漏斗中的上层液体； 操作：下层液体从分液漏斗下端管口放出，关闭活塞，换一个接收容器，上层液体从分液漏斗上口倒出
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皮皮学刷刷变学霸
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【简答题】电阻式传感器分为哪几种?分别适用于哪种场合?
【简答题】热电阻传感器有哪几种?各有何特点及用途?
【单选题】I haven’t seen you for ages. How are you ______ with your English study?
A.
holding on
B.
going on
C.
keeping on
D.
getting on
【简答题】岩溶是指（）在水的作用下形成的溶蚀地貌现象。
【单选题】I haven’t seen you for so long. How have you been?
A.
Not bad.
B.
Excuse me.
C.
Nice to meet you too.
D.
Thank you.
【单选题】—I haven’t seen you for ages. Where have you been? — I _______ on leave in Europe.
A.
have been
B.
am
C.
was
D.
had been
【单选题】听力原文：M: Where did you get that rare book? I haven’t seen you read it before. W: It was packed away until last week. It’s a family heirloom. Q: What do we learn about the rare book? (18)
A.
It has been in her family a long time.
B.
Her boyfriend gave it to her.
C.
The family doesn't like it.
D.
It is a family disgrace.
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