直接刺激B细胞产生抗体
A．抗原决定簇B．胸腺依赖性抗原C．胸腺非依赖性抗原D．完全抗原E．共同抗原
参考答案：C
The traffic ______ very bad ______ the snowstorm. [ ]
A. was, because
B. was, because of
C. were, because
D. were, because of
简述气体辅助注塑成型。
