对进口旧机电产品，海关凭检验检疫机构签发的《旧机电产品进口备案书》验放。 ( )
参考答案：错
对硝酸毛果芸香碱的表述正确的是（）
A.为萜类药物
B.本品是N胆碱受体激动剂
C.本品是M胆碱受体激动剂
D.对汗腺有影响，对眼压无影响
E.临床上用于继发性青光眼
TCP (Transmission Control Protocol) was specifically designed to provide a reliable end-to-end byte stream over a(n)（）.
A．IP address
B．reliable network
C．socket
D．unreliable internet work
