大青叶主产于()
A.四川、江苏
B.广东、广西
C.河北、江苏
D.云南、黑龙江
E.江苏、西藏
参考答案:C
The population of many Chinese cities has _________ doubled in the past 30 years.
A.larger than
B.more than
C.as great as
D.quite a bit
传输设备机柜外露的尾纤不加PVC波纹管保护可能受到如下()。
A.性能受温度影响大
B.老鼠咬
C.外物牵绊
D.重物压迫