我国国内航行木材船热带淡水载重线按规定表示为（）。
A．LTF
B．MRQ
C．MBDD
D．LRQ
参考答案：B
He left ______ with my secretary that he would call again in the afternoon.He said he would keep ______.
A．word；his word
B．words；his words
C．word；word
D．the word；his word
继发性红细胞增多症是( )
A．血容量减少B．白细胞减少C．血小板减少D．动脉血氧饱和度减低E．红细胞生成素减低
