早孕人工流产子宫内膜为( )
A．蜕膜样组织B．绒毛组织C．分泌期内膜D．增生期内膜E．非典型增生期内膜
参考答案：B
The old man ______live with his wife, but now he ______alone after she died. [ ]
A. used to; is used to live
B. used to; is used to living
C. was used to; used to live
D. is used to; is used to live
膜盒结构的差压变送器通常所测差压比工作压力小的多，由于操作或其他因素难免会使膜盒单向受压，为了使测量元件不因此而受到影响，所以在膜盒结构中都有（）
A、限位装置
B、锁定装置
C、单向过载保护装置
D、泄压装置
