题目内容

正常人外周血液T细胞占淋巴细胞总数的()。

A. 10%~15%
B. 30%~50%
C. 40%~55%
D. 60%~80%
E. 80%~90%

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反映测站周围卫星信号遮挡情况的图件叫()。

The Light List shows a lighted aid to navigation on the left bank. This means that the light can be seen on the starboard side of a vessel().

A. ascending the river
B. descending the river
C. crossing the river
D. proceeding towards sea

动态DLAN

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