餐后双下肢骨折病人，胃排空时间与正常时对比有何变化()
A．加快
B．减慢
C．与脂肪含量有关
D．不变
E．与蛋白质含量有关
参考答案：B
电阻R1 = 10欧，R2 = 20欧，串联后接在电压为9伏的电源上，通过R1的电流强度是________安；并联后再接到上述电源上，这时通过R2的电流强度是________安，通过电源的电流强度是________安．
_____ we were worried about was _______ they could manage to control the pollution.
A．That; how
B．That; whether
C．What; that
D．What; whether
