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【单选题】
气缸是 () 元件A.
气动动力元件
B.
气动控制元件
C.
气动执行元件
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举一反三
【单选题】You'd better not ask him for help. He will not try his best _____he agrees to help you.
A.
.although
B.
even if
C.
because
D.
as though
【单选题】智能火灾报警系统中报警设备分为自动感应报警设备和手动确认报警设备两种，下列属于手动确认报警设备的是______。
A.
点型光电感烟火灾探测器
B.
手动报警按钮
C.
点型感温火灾探测器
D.
可燃气体探测器
【单选题】You'd better not ask him for help. He will not try his best ___ he agrees to help you.
A.
although
B.
even if
C.
because
D.
even though
【单选题】You'd better not ask for help. She will not try her best _____ she agrees to help you.
A.
although
B.
even if
C.
because
D.
even so
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