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【单选题】
当把一个气体混合物冷凝时,开始产生第一个液滴的点叫作:A.
沸点
B.
泡点
C.
露点
D.
凝点
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反馈参考答案：
举一反三
【单选题】From the passage, you can tell that people prefer glass fiber cables to copper cables because ______.
A.
glass fiber is less expensive
B.
glass fiber delivers messages directly
C.
glass fiber is more up to date
D.
glass fiber is easier to make
【单选题】Glass-fiber cables can carry hundreds of telephone conversations ______.
A.
spontaneously
B.
simultaneously
C.
immediately
D.
immiscibly
【单选题】Glass-fiber cables can carry hundreds of telephone conversations ______ .
A.
at length
B.
at the moment
C.
at the same time
D.
at intervals
【简答题】说明发生致癌作用的主要过程,以及加速或减缓这些过程的种因素。说明三种直接或间接证明致癌作用的测试方法。
【单选题】下列能够表示给予某人8折优惠的是()
A.
allow sb. 20% discount
B.
give sb. 80% discount
C.
pay sb. 20% discount
D.
make sb. 80% discount
【单选题】Glass-fiber cables can carry hundreds of telephone conversations simultaneously .
A.
at the same time
B.
without distortion
C.
with safety
D.
in little space
【单选题】________ cables are composed of a glass or plastic inner core surrounded by cladding, all encased in an outside jacket.
A.
Twisted-pair
B.
Coaxial
C.
None of these
D.
Fiber-optic
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