下列运算正确的是[ ]
A.5a﹣(b﹣1)=5a﹣b﹣1
B.3a+2(2b﹣1)=3a+4b﹣1
C.2a﹣(3a+2)=﹣a+2
D.4a﹣(2a+5)=2a﹣5
答案:D
根据句意和汉语注释,写出单词的正确形式。
1. Eddie often goes to the park for a walk with his _____ (主人) after supper.
2. The lovely room is the _____ (双胞胎), not their parents'.
3. How many _____ (家庭) are there in the village? Only one.
4. what is your _____ (特别喜爱的) sport? Volleyball.
5. _____ (对不起) me, may I borrow your bike, please?
对于安全泄压排放量大的中低压容器最好采用()。
A、全启式安全阀;
B、微启式安全阀;
C、爆破片;
D、不能确定