清理主油箱必须使用36伏安全电压的行灯。()
参考答案:错
自控仪表导压管安装中,化肥高压管宜采用()连接方式。
A.丝扣法兰
B.丝扣活接头
C.气焊焊接
D.焊接
Her efforts resulted________her success while her brother's failure resulted________his laziness. [ ]
A. from;from
B. from;in
C. in;from
D. in;in