下列哪些疾病不能使腹脂线肿胀的有()
A.局限性腹膜炎
B.腹外伤
C.急性胆囊炎
D.胃肠道穿孔
E.急性阑尾炎
参考答案:C, D, E
光学显微镜与电子显微镜的主要区别有哪些?
I don't think you can work out the maths problem ____ the teacher's help.
A.since
B.unless
C.because
D.without