吊运熔化或炽热金属的钢丝绳，应采用( )等耐高温的钢丝绳。
A．有机芯
B．石棉芯
C．软钢丝芯
D．硬钢丝芯
参考答案：B
He is a _____ teacher, and he explains every problem to his students with great _____. [ ]
A. patiently; patience
B. patiently; patient
C. patient; patience
D. patient; patient
气化炉开车前的升温采用的是（）升温。
A.低压
B.高压
C.负压
D.常压
