白肋烟上绳晾挂时，烟绳相距（）cm。
参考答案：18-20
Nearly three days after an 8.8-magnitude earthquake, rescuers in Chile were making every effort to _______ possible survivors.
A．trap
B．reach
C．shelter
D．seize
原料、辅料、包装材料等是（）。
A.标准操作规程
B.配制规程
C.物料
D.洁净室
in Chile were making every effort to _______ possible survivors.