正常成年人的脉搏为不低于90次/分。
参考答案:错
Mr. Brown likes _____________ food very much. [ ]
A. Japan
B. Japan's
C. Japanese
D. Japanese's
The two factors which make underwater hull repair difficult are accessibility and the().
A.availability of tools
B.shape of the hull
C.pressure exerted by the water
D.threat of progressive flooding