高空旋转的敞开式座舱,如自控飞机、弯月飞车等,均应采用安全带,其带宽30mm左右,应采用()材料
A、尼龙编织带
B、皮带
C、人造革带
D、棉线带
参考答案:A
钠石灰中含()
A.95%NaOH及5%Ca(OH)2
B.5%NaOH及50%Ca(OH)2
C.20%NaOH及80%Ca(OH)2
D.5%NaOH及95%Ca(OH)2
E.5%NaOH、15%Ba(OH)2及80%Ca(OH)2
—The number of the tigers is getting __________. —I agree _______ you.
A.more and more; to
B.smaller and smaller; to
C.smaller and smaller; with
D.more and more; on