阅读以下说明，回答问题1～7，将解答填入对应的解答栏内。 图3-1是在网络中划分VL

甲数是40，比乙数小10，甲数是乙数的______%，乙数是甲数的______%．

-- May I use your pen? Mine is broken.

-- Of course, here are two and you can use ________ of them.

A．both

B．every

C．any

D．either

实验室有失落标签的四瓶五色溶液：MgSO₄、NaOH、HNO₃和NaCl．现在只提供一瓶酚酞试液和几支试管，请你用两步将它们一一鉴别出来，并完成下列表格．

The people had to work hard On their farms, because their lives ______ their crops.[ ]

A. depends on    

B. depends      

C. depend on     

D. on

在中性点不接地系统中在何种情况下要加装消弧线圈？