筛选是根据药物与杂质的哪点不同来分离药物中的杂质( )
A. 比重
B. 体积
C. 浮力
D. 色泽
E. 气味
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Which of the following statements is True
A. The problem of the health care for Americans is no longer a national concern.
B. Doctors in America don't care much about the future of the health care system.
C. Addressing the challenges will undermine the system of private care in America.
D. Improvement of the health security system ill America is a very delicate problem to handle.
During Prohibition, illegal alcohol was ______.
A. sold openly
B. no longer a temptation
C. a major factor in the passage of the Volstead Act
D. brought across the Mexican and Canadian borders
People used to wear special clothes to ______.
A. chase away the evil spirits
B. please the good spirits
C. show their happiness
D. show their anger
选择可摘局部义齿基牙的原则中，哪条不正确
A. 虽有牙周疾病，但已得到控制
B. 虽有牙体疾病，但已经治疗
C. 选择健康牙作基牙
D. 越近缺隙的牙作基牙固位，支持效果越好
E. 选用多个基牙时，彼此越平行越好
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