下列哪项检查对诊断血栓闭塞性脉管炎的帮助最小?()
A.肢体抬高试验
B.皮肤测温检查
C.X线平片
D.多普勒超声检查
E.肢体血流图
参考答案:C
(66) is a one-way function that takes an arbitrarily long piece of plaintext and from it computes a fixed-length bit string. (67) is a protocol that most USENET machines how use it to allow news articles to propagate from one machine to another over a reliable connection. (68) is an approach preferred by cable TV providers. In this solution the fiber terminates at an optoelectrical converter and the final segment is a shared coaxial cable. (69) is a device used to connect two separate network that use different communication protocol. (70) js a digital-to-digital polar encoding method in which the signal level is always either positive or negative.
A.Router
B.Gateway
C.Bridge
D.hub
贵州的气候,极端最低气温曾经出现在()。
A、威宁
B、玉屏
C、赫章
D、铜仁