如将交流电磁铁用在相同电压的直流电路中，虽然可以使用但是吸力不足。
参考答案：错
裂解气压缩机四段出口压力是根据（）的压力确定的。
A.一段吸入压力
B.压缩比
C.四段出口温度
D.冷箱操作压力
______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
A．What
B．Though what
C．In spite of what
D．However what
