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【单选题】
玻璃纤维是非晶型无机纤维,主要成分为( )A.
二氧化硅与Ca、B、Na、Al、Fe等的氧化物。
B.
氧化镁与Ca、B、Na、Al、Fe等的氧化物。
C.
二氧化锆与Ca、B、Na、Al、Fe等的氧化物。
D.
氧化锌与Ca、B、Na、Al、Fe等的氧化物。
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举一反三
【单选题】If you suspect that the illness might be serious you should not ______ going to the doctor.
A.
put off
B.
put aside
C.
hold back
D.
hold up
【简答题】If you suspect that the illness might be serious, you should not ________ going to the doctor. A) pick out B) make out C) put off D) give off
【单选题】If you suspect that the illness might be serious, you should not ______ going to the doctor.
A.
pick out
B.
make out
C.
give up
D.
put off
【单选题】__________you suspect something, I may as well tell you the whole truth.
A.
Since
B.
Until
C.
After
D.
While
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