用配方法将方程x2+6x-11=0变形为[ ]
A.(x-3)2=20
B.(x+3)2=20
C.(x+3)2=2
D.(x-3)2=2
答案:B
Beijing announced on Sunday that the date for events ____ the 40th anniversary of the normalization of China-Japan relations would be “adjusted to an appropriate time”.
A.marked
B.marking
C.having marked
D.to be marked
浆液的()和粘度是决定浆纱上浆率和浆液对浆纱被覆与浸透程度的主要因素。