机动船驶近弯曲航段，不能会船的狭窄航段，不论有无来船，都应当按规定鸣放声号。
参考答案：错
The professor spoke so fast that I found him.
A．it hard following
B．it being hard to follow
C．hard to follow
D．it hard to follow
T淋巴细胞的免疫标志
A．CD33B．CD3C．CD19D．CD41E．CD4
