计算:(a-b)-(a+b)=______.
(a-b)-(a+b)=a-b-a+b=-2b.
You are always telling me I am lazy. Look at your room. What a mess it is! ________.
A.The day has eyes, the night has ears
B.The great thieves punish the little ones
C.That is like the pot calling the kettle black
D.When one will not, two cannot quarrel
根据SOLAS公约,油船、化学品液货船、气体运输船应配备()。
A.耐火救生艇
B.全封闭救生艇
C.自由降落式救生艇
D.轻型玻璃钢救生艇