单项选择题

一般而言，手法循直线操作时，向心方向的直推为补法，离心方向的直推为泻法。

A．对
B．错

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用单词的正确形式填空。 (3) Bob said that he ______ (prefers/preferred) to run to school.

答案： prefers

多项选择题

In order to suppress melt convection during CZ growth processes,
A、magnetically confined Czochralski growth can be used.
B、float-zone growth method can be used.
C、a growth chamber in microgravity can be used.
D、the melt temperature should be as high as possible.