车刀切削部分的硬度必须大于材料的硬度。
参考答案:对
患者,男,42岁。l周来入睡困难,甚至彻夜难眠,惊悸怔忡,心中烦热,舌质红,舌苔黄,脉弦数。用药宜首选()
A.酸枣仁
B.柏子仁
C.合欢皮
D.朱砂
E.夜交藤
We needed a new cupboard for the kitchen. So Peter made _____ from some wood we had. [ ]
A. it
B. one
C. himself
D. another