男性患者,60岁,有尿频且夜尿增多,每次排尿费力,尿线变细,首先考虑此诊断是
A. * * 结石B. * * 狭窄C.膀胱结石D.前列腺增生E.膀胱肿瘤
参考答案:D
—Where _____ the flowers?
—They are on the floor. [ ]
A. is
B. be
C. am
D. are
一根电阻丝,通过2C的电荷量所消耗的电能是8J,若在相同的时间内通过4C的电荷量,该电阻丝上所加电压和消耗的电能分别是 [ ]
A.4 V,16 J
B.8 V,16 J
C.4 V,32 J
D.8 V,32 J