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【单选题】
关于矢量场散度的性质哪一条是错误的（ ）A.
一个矢量场的散度构成一个矢量场。
B.
散度不等于0 的点，表示存在散度源。
C.
散度大于0 的点发出矢量线。
D.
散度小于0 的点吸收矢量线。
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【单选题】There were so many ____ offered that I could not refuse the job.
A.
identification
B.
enticements
C.
optimism
D.
flushed
E.
confrontation
F.
viciously
G.
masculine
H.
prominence
I.
react
J.
blinking
【单选题】loads are those that are permanent,including the weight of the structure itself .
A.
Ceiling
B.
Wind
C.
Dead
D.
Snow
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A.
放大，截止，高电平
B.
开关，截止，高电平
C.
开关，饱和，高电平
D.
开关，截止，低电平
【简答题】允许尺寸的变化范围称为 ,标准公差共分为 个精度等级,基本偏差代号轴孔各 个。
【简答题】读短文，判断正(T)误(F)。 Long ago there were many animals on the earth. But now we can't see some of the animals, because they died, such as(例如) dinosaurs. Some animals died of natural disasters(死于天灾). But som...
【单选题】The subject of manners is complex.If it were not,there would not be so many ( ) f ee lings and so much misunderstanding in international communication.
A.
injurious
B.
injured
C.
injuring
D.
injury
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