正常足月儿的皮肤外观特点是
A.肤色稍黄,皮下脂肪少B.肤色红润,皮下脂肪少C.肤色红润,皮下脂肪丰满D.肤色苍白,皮下脂肪丰满E.肤色稍黄,毳毛少
参考答案:C
These books are my _____.[ ]
A. students
B. student's
C. students'
D. students of
堆料皮带速度2m/s,堆料机大车行走沿堆料皮带运行方向速度30m/min,求堆料机大车行走逆向速度.