A.They tend to overlap as they appear.
B.They tend to result from the residual matter of supernovas.
C.They tend to generate in sudden irregular fits.
D.They tend to destroy their progenitor clouds.
E.They tend to form. away from gas coronas.
第7题
团的地方各级委员会的候补委员一般应占委员、候补委员总数的()。
A.30%—40%
B.20%—30%
C.10%—20%
D.40%—50%
第8题
在一般砌体结构房屋中,墙的造价占全部建筑造价的()。
A.10%~20%
B.20%~30%
C.30%~40%
D.40%~50%
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