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【多选题】
下列说法正确的有 ( )。A.
密封电池组搁置不用时间超过3个月时，均充。
B.
安装蓄电池组时，所用金属工具必须绝缘。
C.
因为三相负载不平衡，所以三相供电系统中零线电流不等于零。
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A.
Animals' carefulness.
B.
The water content in its silk glands.
C.
The proteins.
D.
The mulberry leaves
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A.
Right
B.
Wrong
C.
Not mentioned
【单选题】She removed ________ hat she was wearing and tried on ________ black silk one. [ ]
A.
a; a
B.
the; the
C.
the; a
D.
a; the
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