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【单选题】
2008年9月，中国爆发三鹿婴幼儿奶粉受污染事件，导致食用了受污染奶粉的婴幼儿产生肾结石病症，其原因是奶粉中含有三聚氰胺。三聚氰胺的分子式为C 3 N 3 (NH 2 ) 3 ，下列有关三聚氰胺的说法不正确的是A.
三聚氰胺的摩尔质量为126g/mol
B.
三聚氰胺中C、N、H的原子个数比为1：2：2
C.
三聚氰胺中C、N两种元素的质量比为6：7
D.
三聚氰胺中氮元素的质量分数约为66.7％
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【单选题】— ______ Mr White good at singing? —Yes, he teaches ______ music this year. [ ]
A.
Does, us
B.
Is, us
C.
Does, our
D.
Is , our
【多选题】曲轴主轴颈或轴承磨损严重,间隙过大,将造成( )
A.
机油压力过高
B.
机油压力过低
C.
气缸上部有金属敲击声
D.
突然加速或减速时，出现低沉、钝哑的“嘡嘡”声
E.
单缸断火时响声无变化，相邻两缸断火响声减弱或消失
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【单选题】热导池检测器的灵敏度随着桥电流增大而增高,因此,在实际操作时桥电流应该( )。
A.
越大越好
B.
越小越好
C.
选用最高允许电流
D.
在灵敏度满足需要时尽量用小桥流
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