承力索用钢芯铝绞线或铝包钢线时,其钢芯若断股,则()。
A、用同材质线补强后使用
B、必须切断重新接续
C、不作处理继续使用
D、必须局部更换为同材质承力索
参考答案:B
气虚之体,外感风寒湿者,治宜选用()
A.九味羌活汤
B.藿香正气散
C.羌活胜湿汤
D.独活寄生汤
E.败毒散
Firefighting foam is only effective when the foam().
A.penetrates to the bottom of the fire
B.is kept saturated with low-velocity water fog
C.mixes with the burning fuel oil
D.completely covers the top of the burning liquid