某物质的化学式为RCl2，相对分子量为M，R的相对原子质量为 ．
M﹣71
胃溃疡最常发生的部位是（）
A.贲门旁
B.胃后壁
C.胃小弯
D.胃大弯
E.幽门前壁
The service economy doesn't suggest that we convert our factories into laundries to survive.
A．imply
B．persuade
C．hurl
D．transform
