His money already last month. [ ]
A. run out of
B. run out
C. ran out of
D. ran out
答案:D
线段AC和BC在同一条直线上,如果AC=5cm,BC=3cm,线段AC和BC的中点分别是M、N,则MN=______.
收集气相冷凝液的小槽容积过大对实验结果有无影响?