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【简答题】
微分方程的含有的任意独立常数的个 数若与微分方程的 数相同,则该解叫做微分方程的通解。
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【简答题】下面一组图形为三棱锥 P - ABC 的底面与三个侧面.已知 AB ⊥ BC , PA ⊥ AB , PA ⊥ AC . (1)在三棱锥 P - ABC 中,求证:平面 ABC ⊥平面 PAB ; (2)在三棱锥 P - ABC 中, M 是 PA 的中点,且 PA = BC =3, AB =4,求三棱锥 P - MBC 的体积.
【简答题】已知三棱锥P-ABC,PA⊥AB,PA⊥AC,∠BAC=120°,PA=AB=AC=2,则三棱锥的外接球体积为________.
【单选题】up late at night is bad for our health.
A.
Stays    
B.
.Stay C. Staying
【单选题】The only way to ______ the place where they are staying is by mail.
A.
arrive
B.
arrive at
C.
get to
D.
reach
【判断题】临习小篆的时候,对于有字框的笔画,一般应写出框内的笔画,随后再写外框的部分。
A.
正确
B.
错误
【单选题】冯.诺依曼体系结构的计算机硬件系统的5大部件是()
A.
输入设备、运算器、控制器、存储器、输出设备
B.
键盘和显示器、运算器、控制器、存储器和电源设备
C.
输入设备、中央处理器、硬盘、存储器和输出设备
D.
键盘、主机、显示器、硬盘和打印机
【单选题】I think English is too difficult. At times I feel like ______.
A.
staying up             
B.
giving up              
C.
giving out
【简答题】已知三棱锥P-ABC中,PA⊥AB,PA⊥AC,∠ACB=90°(如图) (1)求证:PA⊥BC; (2)若PA=AC=BC=1,求点C到平面PAB的距离.
【简答题】B. My secret for staying young is . Put all attention to the part of you---your brain and keep it young and growing. Keep your mind awake and you’ll stay young all over. These are exciting time....
【单选题】She is a diligent student, and all her spare time she has _____ staying in the library.
A.
is spent
B.
spent
C.
to spend
D.
to be spent
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