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【单选题】
规定正常水位为0m,高于正常水位0.5m时,记作+0.5米,下列说法错误的是( )A.
高于正常水位 1.5m 记作＋ 1.5m
B.
低于正常水位 1.5m 记作－ 1.5m
C.
－ 1m 表示比正常水位低 1m
D.
＋ 2m 表示比正常水位低 2m
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【简答题】Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van(住房汽车) ...
【单选题】关于氢键，下列说法正确的是（ ）
A.
氨易液化与氨分子间存在氢键无关
B.
H 2 O是一种非常稳定的化合物，这是由于氢键所致
C.
甲硫醇（CH 3 SH）比甲醇的熔点低的原因是甲醇分子间易形成氢键
D.
HBr在水中的溶解性很大，原因是HBr与水形成了分子间氢键
【简答题】______ the of a breach of any of the provisions of this Agreement ______ one party, the other party may ______ its option to cancel this Agreement by one party.
【单选题】下列各组物质的水溶液中，溶质分子与其离子之间存在电离平衡的是 ( )
A.
氨水、氯水
B.
HNO 3 、H 2 SO 4
C.
Ba(OH) 2 和BaSO 4
D.
醋酸、酒精
【单选题】Americans with small families own a small car or a large one. If both parents are working, they usually have two cars. When the family is large, one of the cars is sold and they will buy a van.A small...
A.
a motor car
B.
a motor home
C.
a big truck
D.
a motor bike
【简答题】Evaluate and revise two essays in terms of all four bases: unity, support, coherence, and sentence skills. Comments follow each supporting paragraph. Circle the letter of the one statement that applie...
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