钢尺的尺长误差对距离测量产生的影响属于________。
水准尺向前或向后方向倾斜对水准测量读数造成的误差是________。
You can _____ some bottles of wine, or some chocolates, or a bunch of flowers.
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧