在排水不良的土壤中,会产生和积累硫化氢等有毒物质,毒害草坪草的()。 A.叶片 B.

题型:单项选择题

问题:

在排水不良的土壤中,会产生和积累硫化氢等有毒物质,毒害草坪草的()。

A.叶片

B.叶鞘

C.花

D.根系

考点:中级绿化工考试中级绿化工考试题库
题型:单项选择题

体育运动中,科研人员经常利用频闪摄影对运动员的动作进行分析与指导.频闪摄影就是摄影光源在有节奏的闪光时,从光源射出的光线照射到运动员身上发生______,又通过摄影机前的______镜形成______像.观察图中照片,可知频闪摄影时要求背景较______(填“亮”、“暗”).

题型:单项选择题

长期反复发作头痛或搏动性头痛常见于

A.血管性头痛

B.肌紧张性头痛

C.脑肿瘤

D.蛛网膜下腔出血

E.丛集性头痛

题型:单项选择题

霍乱病例临床分型不包括()。

A、轻型

B、重型

C、危重型

D、中毒型

题型:单项选择题

The metric assigned to each network depends on the type of protocol. Some simple protocol, like RIP, treats each network as equals. The ______ of passing through each network is the same; it is one ______ count. So if a packet passes through 10 network to reach the destination, the total cost is 10 hop counts. Other protocols, such as OSPF, allow the administrator to assign a cost for passing through a network based on the type of service required.A ______ through a network can have different costs (metrics). For example, if maximum ______ is the desired type of service, a satellite link has a lower metric than a fiber-optic line. On the other hand, if minimum ______ is the desired type of service, a fiber-optic line has a lower metric than a satellite line. OSPF allow each router to have several routing table based on the required type of service.

A. costB. link-stateC. connection D. diagram

题型:单项选择题

以下哪种放货形式非集装箱货运实务中所谓的“电放”形式。()

A.电报、电传

B.传真放货

C.电子邮件放货

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