如在短期内无法做出鉴别，又急需尽快缓解呼吸困难时，可选用
A. 地高辛
B. 氨茶碱
C. 吗啡
D. 溴己新(必嗽平)
E. 强的松
What is a bond's yield？______.
A. The same as the coupon.
B. The time until a bond matures.
C. The annual return until the bond matures.
D. The total risk offered by a bond.
根据《UCP600》的相关规定，下列注有()字样的提单可以被银行接受。
A. Shipped on deck
B. Five cartons are broken
C. The goods may be carried on deck
D. FiVe bags are wet
某元素原子的质量数为A，它的阴离子Xn-有x个电子，ω克这种元素的原子核内中子数为()mol。
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