直流保护和换流变电气量保护可采用（）配置。
A.单重化
B.双重化
C.三重化
D.四重化
参考答案：B, C
John has put on so much weight recently that his mother has to ________ all his trousers to his measure.
A．makeup
B．giveaway
C．bringin
D．letout
中餐摆台摆放筷子时应注意筷子离骨碟（）。
A.1CM
B.2CM
C.3CM
D.4CM
