培养物缺钾时，生长缓慢，叶片变黄。
参考答案：对
存在于血浆的凝血因子下列哪项是错误的（）
A.因子Ⅰ
B.因子Ⅲ
C.因子Ⅴ
D.因子Ⅶ
E.Ca2+
Can you tell me if you have found the key _____ your car.
A. for
B. to
C. about
D. by
