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【单选题】
下列铸造多晶硅的制备方法中,（）没有坩埚的消耗，降低了成本，同时又可减少杂质污染长度。A.
布里曼法
B.
热交换法
C.
电磁铸锭法
D.
浇铸法
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举一反三
【单选题】You should go to the grand opening ceremony, ____________ ?
A.
aren't you
B.
shouldn't you
C.
wouldn't you
D.
don't you
【单选题】The opening in the deck beneath the anchor windlass that leads to the chain locker is the ____.
A.
Hawse pipe
B.
Fall pipe
C.
Drop-pipe
D.
Spill pipe
【单选题】I don't mind _____ the door. [ ]
A.
you open
B.
your open
C.
your opening
D.
yours opening
【单选题】―We didn’t see Robert at the opening ceremony yesterday. ―No, he _______ it.
A.
mustn’t have attended
B.
needn’t have attended
C.
needn’t attend
D.
didn’t need to attend
【单选题】I don't mind _ the window. It is hot in the room. [ ]
A.
to open
B.
opened
C.
opening
D.
to opening
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