外胚乳是()发育而成的类似胚乳的贮藏组织,包于胚乳外。
A. 反足细胞
B. 中央细胞
C. 珠心组织
D. 受精极核
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齿轮泵的缺点是存在单向径向力,部分机件容易磨损、流量()。
You are developing a Windows Azure application in which a web role and worker role will communicate by using a Windows Azure Queue. You need to recommend an approach for ensuring that the worker role does not attempt to process any message more than three times. What should you recommend?()
Appropriately handle poison messages.
B. Decrease the visibility timeout for messages.
C. Reduce the time-to-live interval for messages in the queue.
D. Increase the number of worker role instances reading messages from the queue.
用于治疗十二指肠溃疡病的药物是()。
A. 氨茶碱
B. 利舍平
C. 对氨基水杨酸钠
D. 苯巴比妥
E. 西咪替丁