Questions 下列各 are based on the following passage. The number of postgraduate students
A.The increase in tuition and fees.
B.The ever-rising living expenses.
C.Changed immigration policies.
D.Universities tightened budgets
A.The increase in tuition and fees.
B.The ever-rising living expenses.
C.Changed immigration policies.
D.Universities tightened budgets
设A、B均为n阶方阵,则必有()。
A.|A+B|=|A|+|B|
B.AB=BA
C.|AB|=|BA|
D.(A+B)-1=A-1+B-1
均质T型杆,OA=BA=AC=l,总质量为m,绕O轴转动的角速度为ω,如图所示。则它对O轴的动量矩LO=______。
用间接碘量法测定BaCl2的纯度时,先将Ba2+沉淀为Ba(IO3)2,洗涤后溶解并酸化,加入过量的KI,然后用Na2S2O3标准溶液滴定,此处BaC12与Na2S2O3的计量关系[n(BaC12):n(Na2S2O3)]为()。
A.1:2
B.1:3
C.1:6
D.1:12
What does the author conclude about preparing suitable questions for a research project?
A.It is more difficult than the student researcher may realize.
B.The researcher should get help from other people.
C.The questions should be brief so that they will he understood
D.It is important to follow formulas closely.
How can I ever concentrate if you are continually ______ me with silly questions?
A.intimating
B.interfering
C.interrupting
D.invading
A.why the skillet is a handy piece of kitchen equipment
B.the digestibility of fried foods
C.how the experts can mislead the public in the area of food preparation
D.why fried foods have long been frowned upon
A.向上
B.向下
C.为零
D.侧向
What is the author's attitude toward changes brought on by technological innovation?
A.He is excited about them.
B.He is disturbed by them.
C.He questions their usefulness.
D.He accepts them as natural.
What is the author's attitude toward changes brought on by technological innovation?
A.He is excited about them.
B.He is disturbed by them.
C.He questions their usefulness.
D.He accepts them as natural.