不安抗辩权是指在双务合同中承担债务并应先履行债务的当事人，在他方缔约后财产状况恶化，可能难以履行债务，危及后履行一方的债权时，可以解除合同的权利。 ()
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企业的应收账款数额为()万元。
A. 200
B. 240
C. 280
D. 320
The total market value of all final goods and services produced within a given period by factors of production located within a country is______.
A. net national product
B. net national income
C. gross domestic product
D. gross national product
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