铅蓄电池在充电过程中，电解液变（）
参考答案：稀
22. The police have ________anyone with information to come forward and talk to them.
A．admitted to
B．appealed to
C．allowed for
D．called for
弯曲时，当弯曲半径大于或等于材料厚度的（）倍时，中性层在材料的中间。
A.12
B.16
C.18
D.22
