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【单选题】
所谓的工业管道当量粗糙高度是指A.
和工业管道粗糙高度相同的尼古拉兹粗糙高度；
B.
和尼古拉兹粗糙高度相同的工业管道粗糙高度；
C.
和工业管道λ值相同的尼古拉兹粗糙高度；
D.
和工业管道粗糙区λ值相等的同直径的尼古拉兹管的粗糙高度。
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【单选题】Always make sure you protect your skin against the sun because whenever you _________ your skin to the sun, you are increasing your chance of skin cancer.
A.
expose
B.
insert
C.
bind
D.
dispose of
【单选题】Let's not wait any longer, he might not（）at all.
A.
turn over
B.
turn up
C.
turn on
D.
turn down
【单选题】——Let’s go skating after school. ——_____ Call for me at any time.
A.
Wait a moment.
B.
Sounds good.
C.
That depends.
D.
What for?
【单选题】Let’s not wait any longer, he might not ________ at all.
A.
turn over
B.
turn up
C.
used to
D.
turn down
【简答题】Always make sure you protect your skin against the sun because whenever you ________ your skin to the sun, you are increasing your chance of skin cancer.A. bindB. exposeC. insertD. shelter
【简答题】Make sure you insert the disk ______________into the drive.
【简答题】Let's not wait any longer, he might not ____ at all.
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