题目内容

超声检查确诊为葡萄胎的特异性声像图表现是

A. 子宫增大,超过妊娠周数
B. 宫腔内充满大小不等无回声区呈“蜂窝状”
C. 子宫肌层回声不均
D. 子宫肌层血运丰富
E. 子宫肌层变薄

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葡萄胎分为_________、_________两类

Write a telephone message according to the information below.You are working at an office of a school. It is 11 A.M. A call comes in for Kathy. She is teaching a class. It is Mrs. Ross who wants to sign up for summer classes. She wants Kathy to call her before 3 P.M. today at 426-1103.

预应力混凝土构件的控制截面处于消压状态,则( )

A. 控制截面上任意一点混凝土的应力为零
B. 控制截面的抗裂边缘混凝土的应力为零
C. 控制截面上有拉应力的存在
D. 以上说法都不对

先张法预制预应力构件,持久状况正应力验算在计算中采用( )

A. 全截面换算截面
B. 净截面计算
C. 开裂截面
D. 以上都不对

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