说明Q42SA-1.6P的意义。
参考答案:
Q—球阀;
4-法兰连接;
2-直角式;
1.6-公称压力MPa;
SA-密封面聚四氯乙烯;
P-铬镍钛(铌)耐酸钢。
大于-5.1的所有负整数为_____.
---Have you finished your homework _______ ? ------- Not ______.
A.already , yet
B.yet , already
C.yet , yet
D.already already