搜题请搜索小程序“爱下问搜题”
问题 选择题

能正确表示对应变化关系的是（　　）

A．

氢气还原氧化铜

B．

t℃时，CO2和O2的溶解度与压强的关系

C．

氧气是否充足对碳燃烧放出热量的影响

D．

向烧杯a（有MnO2）、b（无MnO2）中分别加入50g5%的双氧水

答案

答案：D

选择题

在图所示的电路中，E为电源电动势，r为其内阻，R1和R3均为定值电阻，R2为滑动变阻器。当R2的滑动触头在a、b间中点时闭合开关S，三个电表A1、A2和V的示数分别为I1、I2和U。现将R2的滑动触头向a端移动，则三个电表示数的变化情况是

A．I1增大，I2 不变，U增大

B．I1减小，I2 增大，U减小

C．I1增大，I2 减小，U增大

D．I1减小，I2 不变，U减小
查看答案
单项选择题

The API changes should provide both source and binary (71)for programs written to the original API. That is, existing program binaries should continue to operate when run on a system supporting the new API, In addition, existing (72) that are re-compiled and run on a system supporting the new API should continue to operate. Simply put, the API(73) for multicast receivers that specify source filters should not break existing programs, The changes to the API should be as small as possible in order to simplify the task of converting existing (74)receiver applications to use source filters. Applications should be able to detect when the new(75)filter APls are unavailable(e.g., calls fail with the ENOTSUPP error) and react gracefully(e.g., revert to old non-source-filter API or display a meaningful error message to the user).

空白处（74）应选择（）

A.multicast

B.unicast

C.broadcast

D.anycast
查看答案