原装血竭研成粉末的颜色是()
A.橙黄色
B.黄绿色
C.血红色
D.紫红色
E.黑红色
参考答案:C
根据短文内容判断正误,正确的画“√”,错误的画“×”。
My family lives in China. The family has a daughter. It's me. My name is Wang Fang. I'm nine years old.
My father and mother like me. I like them, too. We are a happy family.
( ) 1. My family lives in China.
( ) 2. I'm ten years old.
( ) 3. The family has a son.
( ) 4. We are a happy family.
(每空2分,共10分)如图所示,图线AB是某电源的路端电压随电流变化的关系图线. OM是某固定电阻R1的电流随两端电压变化的图线,点C为两图线的交点,由图象可知:电源电动势E= V,电源的内阻r= Ω,R1的阻值为. Ω,若将R1接到电源两端,则在R1上消耗的功率为 W。若在电源两端接入另一电阻R2,使得电源输出功率最大,则最大输出功率为 W。