下列叙述中，疾病与病因不相符的是 A．夜盲症与缺乏维生素Ａ有关 B．脚气病与缺乏

在△ABC中，∠ABC=30°，边AB=10，边AC可以从4，5，7，9，11取一值．满足这些条件的互不全等三角形的个数是（　　）

A．6

B．7

C．5

D．4

地黄饮子的主治病证是（）

A.丹毒

B.阴疽

C.寒痹

D.喑痱

E.痿证

载运危险化学品的船舶在内河航行、装卸或者停泊，应当悬挂（ ），按照规定显示专用信号。

A．普通标志

B．警示标识

C．专用的警示标志

In (66) the strength of the carrier signal is varied to represent binary 1 or 0. (67) is a system that can map a name to an address and conversely an address to al name. (68) is a three-way handshaking authentication protocol that it’s packets are encapsulated in the point-to-point protocol. (69) is an approach that enables an ATM switch to behave like a LAN switch. (70) is an guided media which is made of glass or plastic and transmits signals in the form of light.

A．VLAN

B．LANE

C．VPN

D．IPOA