职业病诊断的依据？

一个圆形花圃的直径是21米，沿着它的边线大约每隔3米钟一棵树，一共要种植多少棵？

患儿，女，5岁。面色蒌黄，形体明显消瘦，肚腹膨胀，腹部皮褶厚度<0．4Cm，首先考虑的诊断及分度是

A．消化不良轻度
B．营养不良重度
C．营养不良轻度
D．消化不良重度
E．营养不良中度

Networks can be interconnected by different devices. In the physical layer, networks can be connected by （66） or hubs, which just move the bits from one network to an identical network. One layer up we find bridges and switches, which operate at data link layer. They can accept （67） , examine the MAC address, and forward the frames to a different network while doing minor protocol translation in the process. In the network layer, we have routers that can connect two networks. If two networks have （68） network layer, the router may be able to translate between the packet formats. In the transport layer we find transport gateway, which can interface between two transport connections. Finally, in the application layer, application gateways translate message （69） . As an example, gateways between Internet e-mail and X.400 e-mail must （70） the e-mail message and change various header fields.

（66）处填（）。

A．reapers

B．relays

C．connectors

D．modems

下列疾病的临床表现描述，不正确的是（）

A.膀胱炎可出现尿频、尿急、尿痛

B.糖尿病出现尿频但无尿急、尿痛

C.膀胱结核仅有尿频，无尿急、尿痛和血尿

D.膀胱癌有尿频、尿急、血尿，但多无尿痛

E.尿频、尿急、尿痛伴会阴、腹股沟胀痛见于急性前列腺炎

混凝土抗折强度标准试件为150mm³150mm³400mm。