如图所示梁(等边角钢构成)发生的变形是下述中的哪种变形?() ["平面弯曲","斜弯曲","扭转和平面弯曲","扭转和斜弯曲"]
20/5t桥式起重机零位校验时,把凸轮控制器置“零”位。短接KM线圈,用万用表测量L1-L3。当按下启动按钮SB时应为()状态。 ["A、导通","B、断开","C、先导通后断开","D、先断开后导通"]
药材南柴胡的气味特征是() ["A.辛辣味","B.微涩","C.微甘","D.具败油气","E.刺喉"]
香豆素基本母核是() ["苯骈α-吡喃酮","苯骈α-呋喃酮","苯骈α-吡咯酮","苯骈β-呋喃酮","苯骈γ-吡喃酮"]
"蚯蚓头"形容的是下列哪种药材的性状鉴别特征() ["A.川木香","B.银柴胡","C.党参","D.人参","E.防风"]
工作票存在()的情况,应重新填写工作票。