每周必须检查和调整每只蓄电池电解液的（）。
A.温度
B.比重
参考答案：B
There were lots of people standing watching, yet no one of them ________.
A．offered to help
B．offered helping
C．was offered to help
D．was offering help
射吸式普通焊炬有三种，其型号为G01---30、G01---100和（）。
