心脏肿瘤中,最常见的是()
A.黏液瘤
B.畸胎瘤
C.横纹肌瘤
D.间叶细胞瘤
E.心包囊肿
参考答案:A
The teacher always ______ a smile on her face, so the students never feel_______.[ ]
A. puts on; frightened
B. wears; frightened
C. puts on; frightening
D. wears; frightening
喷涂法一般分为()。
A.低压无空气喷涂法
B.高压空气喷涂法
C.高压无空气喷涂法
D.静电喷涂法