白血病患者的牙龈病损常表现为()。
A.牙龈肿大,颜色暗红发绀或苍白
B.龈缘处组织坏死,溃疡
C.牙龈有明显出血倾向
D.牙龈松软脆弱
E.以上均是
参考答案:E
It is re ported that the United States uses _____ energy as the whole of Europe.
A.as twice
B.twice much
C.twice much as
D.twice as much
由全国人大常委会制定颁布的规范性文件称作()
A.卫生法律
B.卫生法规
C.卫生法
D.法律的渊源
E.法律的规范