下列因素除哪项外，可使血压值升高
A．睡眠不佳
B．寒冷环境
C．高热环境
D．兴奋
E．精神紧张
参考答案：C
He is a student at Oxford University, _________ a degree in computer science.
A．to have studied
B．studied
C．studying
D．to be studying
为什么设计零件时，要提出表面粗糙度的要求
