对厚板进行切割时（）。
A、氧气压力应适当调大
B、割嘴与板间距离应大一些
C、应采用高速切割
D、应选用小的割嘴
参考答案：A
Scientists hope someday to cameras to small ?animals? like bats and birds,so that they can
do filmmaking on animals. [ ]
A.adapt
B.attach
C.appeal
D.adjust
气动调节阀一般在生产现场应有许多附件，逐一说明
