划封头环缝余量线前应调整封头各处直边与划线平台的角度一致。( )
参考答案：对
– Could I use your mobile phone? I have to call my mom for the coming class meeting.
--Yes, of course you _____________.
A．must
B．can
C．need
D．will
请用不超过300字的篇幅，就给定资料所反映的问题提出对策和建议。要体现针对性和可操作性。
