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【简答题】
（1）下列物质能导电的是______________，属于电解质的是________________，属于非电解质的是 _______________。 ①水银 ②烧碱 ③大理石 ④氯化钠晶体 ⑤盐酸 ⑥氨气 ⑦蔗糖 ⑧氯气 ⑨液态氯化氢 ⑩硫酸溶液 （2）按要求写出下列方程式： ① KAl(SO 4 ) 2 电离的电离方程式：____________________________ ② 小苏打电离的电离方程式：____________________________ ③ 碳酸钙与盐酸反应的离子方程式：____________________________
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【简答题】Make sure 确保
【单选题】Jenny pushed the door again to ______ it ______.
A.
make sure if; was closed
B.
make sure that; was locked
C.
found out it; was shut
D.
find out that; was open
【单选题】Why did Chanel test her clothes on moving models? a She wanted to make sure they looked good. b She wanted to make sure that models could move around easily. c She wanted to make sure the material was...
A.
a She wanted to make sure they looked good.
B.
b She wanted to make sure that models could move around easily.
C.
c She wanted to make sure the material was strong enough.
【简答题】已知，则的值为 ．已知 ，则 的值为____．
【简答题】已知 ，则 的大小为（ ）；已知 ，则 的大小为（ ）
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