A diesel engines crankcase oil level is found to be too high√ You should suspect that ().
A. the engine was over filled
B. there might be a fuel leak
C. there might be a water leak
D. all of the above
儿童的发展应是协调的发展,请简述儿童的协调发展主要包括哪些方面。
在项目计划的关键路径上增加投入以便缩短选定活动所需时间的过程称为:()
A. 赶工(CRASHING);
B. 德尔菲法;
C. ABC分析;
D. 枝节法(BRANCH-AND-BOUN。
肉眼估计晶面符号时怎样选择单位面?什么情况下用数字,什么情况下用字母表示?