变压器的分接开关装于()。
A.二次侧
B.一次侧
C.任一侧
参考答案:B
At the shopping centre, she didn’t know what _____ and ______ with an empty bag.
A.to buy, left
B.to buy, leave
C.to be bought, left
D.was to buy, leave
在夏季,小朋友常用“面筋”粘蝉,“面筋”是种子成分中的( )
A.淀粉
B.蛋白质
C.脂肪
D.无机盐