手动式混凝土布料机的放置场地应坚固平整,支腿的水平误差不得大于()mm,必须使支腿在最大范围锁定,确保其稳定性。
A.1
B.2
C.3
D.4
参考答案:C
函数y=-ex的图象 [ ]
A、与y=ex的图象关于y轴对称
B、与y=ex的图象关于坐标原点对称
C、与y=e-x的图象关于y轴对称
D、与y=e-x的图象关于坐标原点对称
—Is this room ______?
—Yes, it's ______. [ ]
A. Lily and Lucy; their
B. Lily's and Lucy's; theirs
C. Lily and Lucy's; theirs
D. Lily and Lucy's; their