问题
单项选择题
流量计主要有哪两种()。
A、压差式和测速式
B、压差式和速度式
C、容积式和测速式
D、容积式和涡轮式
答案
参考答案:D
流量计主要有哪两种()。
A、压差式和测速式
B、压差式和速度式
C、容积式和测速式
D、容积式和涡轮式
参考答案:D
从方框内选单词,用其适当形式填空。每空限填一词,每词限用一次。 | |
2. The person is very . He can give us a satisfied answer. 3. What should we do to help stop ? 4. A serious language should not make such foolish mistakes. 5. What do you think is the most invention? 6. Since then, the of basketball has risen worldwide. |