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【单选题】
下列各种说法中，错误的是（ ）A.
空气成分中，以氮气的体积分数最大
B.
地壳中所含硅元素的质量分数最大
C.
常温下，氢气是最轻的气体
D.
白磷在空气中由于缓慢氧化而易自燃
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举一反三
【单选题】The time and effort he has devoted during the past few years ______ trees in that remote area is now considered to be of great value.
A.
plant
B.
planting
C.
to plant
D.
to planting
【单选题】使用盐桥,将反应 Fe 2+ +Ag + = Fe 3+ +Ag 设计成的自发电池是:
A.
Ag(s)|AgCl(s)|Cl - ||Fe 3+ ,Fe 2+ |Pt
B.
Ag(s)|Ag + ||Fe 3+ ,Fe 2+ |Pt
C.
Pt|Fe 3+ ,Fe 2+ ||Ag + |Ag(s)
D.
Pt|Fe 3+ ,Fe 2+ ||Cl - |AgCl(s)|Ag(s)
【单选题】_______ refers to the time and effort spent learning the rules of a new market.
A.
First mover advantages
B.
Strategic commitments
C.
Pioneering costs
D.
Market entry costs
【简答题】打下课铃后,学生起立,齐声向老师说()。若有听课老师,应()方可自由活动。
【单选题】The time and effort he has devoted during the past few years trees in that remote area is now considered to be of great value .
A.
to planting
B.
to plant
C.
plant
D.
planting
【判断题】Outsourcing is a logical choice when a firm does not have certain expertise and is unwilling to invest the time and effort to develop it.
A.
正确
B.
错误
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