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【多选题】
关于时间和时刻,下列说法正确的是 ( )
A.
时间很长,时刻很短
B.
第 2 s 内和 2 s 都是指一段时间间隔
C.
时光不能倒流,因此时间是矢量
D.
“ 北京时间 12 点整 ” 其实指的是时刻
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【单选题】Some European countries are restricting the planting and importation of GM agricultural products because GM crops could pose unique risks to the environment and to health.
A.
Y
B.
N
C.
NG
【判断题】每种纯液态有机化合物在一定的压力下均有固定的沸点。()
A.
正确
B.
错误
【单选题】在动态测试中,电桥的输出量通常采用()。
A.
电阻量
B.
电流量
C.
电压量
D.
电感量
【单选题】Why does the Australia government allow the importation of the elephants?
A.
As a part of conservation program.
B.
To safeguard the nearing extinct species.
C.
To attract more tourists.
D.
Under the pressure of the public.
【单选题】The passage mentions which of the following as a problem associated with the importation of tulips into North America?
A.
They were no longer fashionable by the time they arrived.
B.
They often failed to survive the journey.
C.
Orders often took six months or longer to fill.
D.
Settlers knew little about how to cultivate them.
【多选题】轮胎外胎的组成部分有( )。
A.
胎面
B.
帘布层
C.
缓冲层
D.
胎圈
【多选题】轮胎的主要组成部分有()。
A.
胎面
B.
外胎
C.
内胎
D.
垫带
【单选题】在动态测试中,电桥的输出量通常采用()
A.
电阻量
B.
电压量
C.
电流量
D.
电感量
【单选题】____ are taxes that governments place on the importation of certain items.
A.
tariffs
B.
surcharges
C.
reciprocities
D.
embargoes
【多选题】轮胎外胎的组成部分有:
A.
胎面
B.
胎肩
C.
胎侧
D.
胎圈
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