对于糖尿病病人,其大手术前血糖应维持在小于()mmol/L
A.6
B.7
C.8
D.9
E.10
参考答案:D
已知sinα>sinβ,那么下列命题成立的是 [ ]
A.若α,β是第一象限角,则cosα>cosβ
B.若α,β是第二象限角,则tanα>tanβ
C.若α,β是第三象限角,则cosα>cosβ
D.若α,β是第四象限角,则tanα>tanβ
用 for 或 since填空。
1. He's been waiting for you ______ two hours.
2. John has been living here ______ 2008.
3. I've been staying in London ______two weeks.
4. Jack has been studying French ______ he was mine.
5. I slept only ______ two hours last night. Now I feel very tired.