下列电器属于利用电流热效应工作的是: [ ]
A.电铃
B.电热毯
C.电视机
D.电风扇
答案:B
多项式xy2+3x2y3+4x5-6是______次______项式,最高次项是______.
Jim won the award, _______ excited everybody in the class.
A.which
B.that
C.this
D.it