Li Lei can _____ English.But his brother can't.[ ]
A. tell
B. talk
C. say
D. speak
答案:D
蒸馏操作是实验室的常规操作之一,为了防止蒸馏过程中发生暴沸,应该如何操作?
耳穴针刺行强刺激时,刺入的深度是()
A.刺入皮下
B.刺穿对侧皮肤
C.刺入皮肤,达软骨后毫针站立不摇动
D.刺入皮肤,穿通软骨