【单选题】一质点在保守力场中沿x轴(在x > 0范围内)运动,其势能为 【图片】 . 式中k、a均为大于零的常数. 则质点所受到的力的表示式为
【单选题】碳和其他合金元素在y-铁中的固溶体称为( )
【单选题】Which of the following statements about the characteristics of debt and equity is false?
A.
They can both be long-term financial instruments.
B.
They can both be short-term financial instruments.
C.
They both involve a claim on the issuer's income.
D.
They both enable a corporation to raise funds.
【单选题】形成虫蚀样空洞(又称无壁空洞)的原因主要是:
【单选题】Which of the following statements about the characteristics of debt and equity is untrue?
A.
They can both be long-term instruments.
B.
They both involve a claim on the issuer's income.
C.
They can both be short-term instruments.
D.
They both enable a corporation to raise funds.
【单选题】Which of the following statements about the characteristics of debt and equity is FALSE?
A.
They can both be long-term financial instruments.
B.
They can both be short-term financial instruments.
C.
They both involve a claim on the issuer's income.
D.
They both enable a corporation to raise funds.
【单选题】碳和其他合金元素在Y-铁中的固溶体称为( )。
【单选题】Which of the following statements about the characteristics of debt and equity are true?
A.
They both can be long-term financial instruments.
B.
They both involve a claim on the issuer’s income.
C.
They both enable a corporation to raise funds.
E.
Only (a) and (b) of the above.
【单选题】天津市河东区201 4年高三二模考试)15. It was not until 1965_______liberated.
【单选题】It was not until 1920____ regular radio broadcasts began.