简述传统的气质类型划分。
参考答案:
(1)胆汁质;
(2)多血质;
(3)粘液质;
(4)抑郁质。
一个圆柱体的体积是90立方分米,如果底面面积是30平方分米,那么它的高是______ 分米,与它等底等高的圆锥体的体积是______立方分米.
Two individuals authorized to serve as a lifeboatman must be assigned to any lifeboat that has a capacity of more than().
A.10 persons
B.20 persons
C.30 persons
D.40 persons