封发应在确认其封面书写发运方向与________________的路向一致后才能进行。
参考答案：实际发运
用恰当的词填空。
1. What's this _____ English?
2. I go to school _____ seven in the morning.
3. The pear is too small. I want a _____ one.
4. Thanks _____ helping me.
5. I want to join art club. Because I want to learn _____ art.
钢制圆轴上作用有三个外力偶，其矩为m1=lkN·m，m2=1.6kN·m，m3=0.3kN·m则该轴的扭矩图为（）。（图中单位均为kN·m）
A．A
B．B
C．C
D．D
