【单选题】Which one of the following is NOT true for the reason why people prefer to buy wood-burning stoves?
A.
The initial cost is very low.
B.
The fuel costs are cheaper.
C.
Wood fires are more efficient, cleaner, and safer than ever before.
D.
The wood-burning stoves are more efficient than gas or oil ones.
【单选题】在题图 10.0.1 所示的桥式整流电路中,若 , R L =100Ω ,二极管的性能理想特性: 若 D 1 开路,则输出 。
【单选题】是以“教学内容现代化”为中心,着眼于充分反映现代科学的成就,强调科学的基本概念与掌握科学的学习方法的课程论是
【单选题】Why does fashion change according to the passage?
A.
Because people prefer variety in life.
B.
Because some people want to create new business.
C.
Because old things are always replaced by new things.
D.
Because some persons promote fashion change to make more money.
【单选题】以下哪一个组织不是蓝海机械总公司的下属法人?
【单选题】外源性凝血需要而内源性凝血不需要的凝血因子是( )