题目内容
（请给出正确答案）
[主观题]
LLDPE and LDPE have lower density than HDPE, because ______.
A、HDPE is primarily a linear polymer
B、LLDPE and LDPE contains branches
C、The formation of side branches will increase the packing efficiency
D、The formation of side branches will reduce the packing efficiency
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在
时发散，在
处收敛，则常数
（ ）.
