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【单选题】
N A 表示加德罗常数，下列叙述正确的是A.
1L0.1mol?L -1 的氨水含有0.1N A 个OH ―
B.
1.7g H 2 O 2 中含有的电子数为0.9 N A
C.
1mol Na 2 O 2 固体中含离子总数为4 N A
D.
标准状况下，2.24L CCl 4 所含分子数为0.1 N A
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【单选题】Not until they left school _____ how much their teachers loved them and helped them. [ ]
A.
they realized
B.
did they realize
C.
they would realize
D.
had they realized
【单选题】Not until they left school how much their teachers loved them and helped them.
A.
they realized
B.
did they realize
C.
had they realized
D.
they would realize
【单选题】某企业借得1000万元的贷款,在10年内以年利率12%等额偿还,则每年应付的金额为( )
A.
1000/(P/A，12%，10)
B.
1000×(P/A，12%，10)
C.
1000×(A/F，12%，10)
D.
1000×(P/F，12%，10)
【简答题】按冒口在铸件位置上分类，主要分为（）冒口与（）冒口之分。
【单选题】Not until they left school ____how much their teachers loved them and helped them.
A.
that they realized
B.
had they realized
C.
when they would realize
D.
did they realize
【简答题】某企业借得 1000 万元的贷款,在 10 年内以年利率 12% 等额偿还,则每年应付的金额为多少?
【单选题】Not until they left school________how much their teachers loved them and helped them.
A.
they realized
B.
did they realized
C.
the would realized
D.
had they realized
【单选题】在反相色谱法中,若以甲醇一水为流动相,增加甲醇的比例时,组分的容量因子k与保留时间tR的变化为
A.
k与tR增大
B.
k与tR减小
C.
k与tR不变
D.
k增大，tR减小
【单选题】Not until they left school ______ how much their teachers loved them and helped them.
A.
they realized
B.
had they realized
C.
they would realize
D.
did they realize
【单选题】Not until they left school how much their teachers loved them and helped them.
A.
they realized
B.
did they realized
C.
they would realized
D.
had they realized
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