What brings about the counter-clockwise swirling of the hurricane

A．The low-pressure area in the center of the storm.

B．The force of waves of water.

C．The trade winds.

D．The increasing heat.

虽有细菌侵入，但未引起化脓性炎症者

A．无菌创口
B．延期愈合创口
C．感染创口
D．工期愈合创口
E．污染创口