若n为正整数,且x2n=7,则(3x3n)2-4(x2)2n的值为[ ]
A.833
B.2891
C.3283
D.1225
答案:B
Identifying which quality standards are relevant to the project and determining how to satisfy them should be addressed during ______ .
A) the conceptual phaseB) the planning processC) project implementationD) risk identification
解释画线字的意思。
1.惟弈秋之为听。
惟: 听:
2.虽与之俱学。
之: 俱:
3.我以日始出时去人近,而日中时远也。
以: 去:
4.孰为汝多知乎?
孰: 汝: