美国的公司所得税除了实行地域管辖权和居民管辖权之外，还坚持公民管辖权。（）
参考答案：错
--- I had thought he would be nervous in this speech competition, but he turned out to be calm.
--- He quite enough preparation for it.
A．should do
B．must do
C．should have done
D．must have done
下列属于成本项目“直接材料”的内容的有（）。
A、备品配件
B、机物料消耗
C、外购半成品
D、办公费
