Why did Dave decide on a full-time career as a diving instructor
A. He had always liked teaching diving.
B. His trainees were pleased with him.
C. It was a chance to earn more money.
查看答案
与牙龈炎、牙龈出血有关的激素
A. 雌激素
B. 孕激素
C. 雄激素
D. 垂体生乳素
E. 促黑素细胞激素
冷菜间卫生控制效果好，抹布可以一布多用。( )
A. 对
B. 错
胎儿膀胱内有尿液
A. 孕11周
B. 孕14周
C. 孕16周
D. 孕20周
E. 孕28周
中期妊娠指
A. 妊娠8周以前
B. 妊娠12周末以前
C. 妊娠13～27周
D. 妊娠20～30周
E. 妊娠28周以后
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