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【单选题】
计算机软件分系统软件和应用软件2大类，其中属于系统软件核心的是( )。A.
数据库管理系统
B.
操作系统
C.
程序语言系统
D.
财务管理系统
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】What is Obama's action to make democratic decisions'?
A.
He climbs up a ladder to make the decisions heard by everyone.
B.
He appeals to every state to have the same standards to value performances.
C.
He will stop the current measurement about the teaching of valid science.
D.
He will try to drive those conservatives mad by changing policies.
【单选题】已知在 1 mol/L HCl 溶液中，φq'Fe3+/Fe2+ = 0.68 V，φq'Sn4+/Sn2+ = 0.14 V。将 20.00 mL 0.10 mol/L Fe3+ 的 HCl 溶液与 40.00 mL 0.050 mol/L SnCl2 溶液相混合，平衡时体系的电势为
A.
0.14 V
B.
0.32 V
C.
0.50 V
D.
0.68 V
【单选题】A good way to train an animal to do something quickly is to ______.
A.
make the action easy
B.
praise it in words
C.
reward it with food
D.
weaken its motivation
【简答题】四环素与土霉素长期大量口服或静脉给予可造成严重_____________损害,也能加剧原有的肾功能不全,影响_____________代谢而增加氮质血症。
【单选题】Our government is taking action to improve the environment.
A.
make…worse
B.
make…better
C.
make…different
D.
make…the same
【简答题】A decision is a choice______(make)from among alternative courses of action that are available.
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