细菌性痢疾的基本病理变化是
A．肠黏膜坏死
B．炎性渗出
C．糠皮状假膜
D．肠髓样肿胀
E．前3项都是
参考答案：E
装卸钻头时，必须使用与钻头相匹配的（），严禁用转盘引扣和上扣。
Swimming in the pool with friends ______ very interesting. [ ]
A. has
B. have
C. is
D. are
