普通水准测量中，高差总和与前视读数总和及后视读数总和的关系为_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

普通水准测量中，高差总和与前视读数总和及后视读数总和的关系为（）

A.Σh=Σa+ΣB

B.Σh=Σa-ΣB

C.Σh=Σb-ΣA

D.以上都不是

答案

参考答案：B

选择题

---Does Tom do his new job well?

---______ his old job. How stupid! I think there is no hope for him.

A．No better than

B．Not better than

C．Not so well as

D．No as well as

填空题

管材、设备运输、存放时的堆放高度、环境条件（）必须符合产品的要求，应避免曝晒和雨淋。