健康成年人心脏射血储备量是安静时的（）
A.1～2倍
B.3～4倍
C.5～6倍
D.7～8倍
E.9～10倍
参考答案：C
Most of the evidence was destroyed in the fire.________it would be almost impossible to prove him
guilty.[ ]
A. Even
B. Still
C. Thus
D. Yet
皮肤出血点的特征是()。
A．直径3～5mm
B．压之不褪色
C．稍高出皮面
D．表面光亮
E．周围有辐射小血管网
