燃料油主要用作各种锅炉和工业炉燃料，一般是由（）和裂化残油等制成的。
A．低沸馏分
B.中间馏分
C.减压馏分
D.直馏渣油
参考答案：D
The infrequent trading of some assets that hedge funds invest in most likely results in hedge fund:（）
A. risk being understated.
B. returns being understated.
C. correlations with other assets being overstated.
第一孔钢桁梁作为第2孔钢桁梁悬臂拼装的平衡梁时，应符合哪些规定？
