液压系统在启动前，所有操纵杆都应处于（）。
A、固定位置
B、工作位置
C、中间位置
D、相应位置
参考答案：C
You can’t _____ until tomorrow morning after the blood examination.
A．not only eat but also drink
B．either eat or drink
C．neither eat nor drink
D．both eat and drink
已知15×18=270，那么150×180=______．
