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问题 单项选择题

关子羊水的描述下列哪项正确

A．羊水的来源是胎儿尿液

B．羊水的吸收由胎膜完成

C．羊水是透明的

D．羊水呈中性或弱碱性

E．羊水过多过少与先天畸形无关

答案

参考答案：D

单项选择题

A 9-month-old, well-nourished boy who lives with his extensive extended family tests positive for tuberculosis. Which of the following is a risk factor for tuberculosis in this client

A. Male sex.
B. The infant is in the 95th percentile for height and weight.
C. His mother did not receive prenatal care until the second trimester of her pregnancy.
D. Ag
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单项选择题

基准物质NaCl在使用前应先( )，再放在干燥器中冷却至室温。

A．在140～150℃烘干至恒重

B．在270～300℃灼烧至恒重

C．在105～110℃烘干至恒重

D．在500～600℃灼烧至恒重
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