《公路工程机械台班定额》中,下列( )不属于可变费用。
A.经常性修理费
B.机上人工费
C.养路费及车船使用费
D.燃料动力费
参考答案:A
Mary couldn't help __________at the news of her grandpa's death. [ ]
A. to burst into tear
B. to burst into tears
C. bursting into tear
D. bursting into tears
患者,男性,82岁,长期便秘,遵医嘱行小量不保留灌肠。
配制"1、2、3"溶液时,硫酸镁、甘油和温开水的量()。
A.30ml,60ml,90ml
B.30ml,90ml,60ml
C.60ml,30ml,90ml
D.60ml,90ml,30ml
E.90ml,60ml,30ml