平面kx+2y-z=6与已知平面x+y+3z=1垂直,则k值为( )。
A.2 B.3C.1 D.5
参考答案:C
根据《企业会计准则》的规定,下列选项中不符合销售商品收入确认条件的是()。
A.收入的金额能够可靠地计量
B.与交易相关的经济利益很可能流入企业
C.相关的已发生或将发生的成本能够可靠地计量
D.企业已将商品使用权上的主要风险和报酬转换给购货方
1. I find that it is difficult to learn English well, so I mu.st study harder.
I find ______difficult_______ _____English well,so I must study harder.
2. He didn't get married until he was in his thirties.
It was______ _______he was in his thirties ______he got married.
3. We started early so that we could arrive there before 8 o'clock.
We started early_______ ______ _______arrivethere before 8 o'clock.
4. They hurried up because it was getting dark.
________ __________ because it was getting dark _______ they hurried up.
5. It's mad of you to go there alone in such bad weather.
________ ________ ________you to go there alone in such bad weather.