正常分娩机转俯屈是胎头遇到阻力以枕额径转为（）A．双顶径 B．_爱下问搜题

搜题请搜索小程序“爱下问搜题”

问题单项选择题

正常分娩机转俯屈是胎头遇到阻力以枕额径转为（）

A．双顶径

B．枕颏径

C．枕下前囟径

D．双电径

E．双颞径

答案

参考答案：C

填空题

用方框中所给单词填空

basketball, watches, let's, look, ping-pong, ball

1. _________ play computer games.
2. _________ at the clock, please. What time is it?
3. Dave has a bat. He plays ________ every day.
4. Mr Wang has a new TV. He ________ TV every night.
5. She has a tennis racket and a tennis _________.
6. I can play _________. It's very interesting.

判断题

声纳是利用声波在水下的传播特性，通过电声转换和信号处理，完成水下目标探测、进行水下通讯、遥测或遥控的设备。