A、(A)1/2
B、(B)1/3
C、(C)2/3
答案:C
A. (A)1/3
B. (B)1/2
C. (C)2/3
A. (A)100kPa
B. (B)150kPa
C. (C)180kPa
解析:解析: J308
解析:解析: 事附30.