钙质母料的耐化学（）性和耐光性较好。A.腐蚀 B.反应 C.污染 D.活动

You are a project manager for a small project. Your project was budgeted for ￥500,000 over a six-week period. As of today, you’ve spent ￥260,000 of your budget to complete work that you originally expected to cost ￥280,000. According to your schedule，you should have spent ￥300,000 by this point. Based on these circumstances, your project could be best described as ______.

A．ahead of schedule

B．behind schedule

C．on schedule

D．having not enough information provided

实验室用锌和硫酸（H₂SO₄）反应制取氢气H₂，同时生成硫酸锌（ZnSO₄）．其化学方程式为______．

明配线管路水平或垂直敷设时，在全长允许偏差不应大于管内径的（）。

基因型

国际上项目总控理论得到成功应用的案例绝大多数发生在( )。

A．美国

B．德国

C．日本

D．英国