长途光缆塑料管道人（手）孔的荷载与强度应符合国家相关标准及规定。
参考答案：对
He began to work there ______________. [ ]
A. on his fifty
B. at ages of fifty
C. when he fifty
D. in his fifties
非促胰岛素分泌型口服降糖药包括（）
A.双胍类
B.格列奈类
C.磺酰脲类
D.α-糖苷酶抑制剂
E.噻唑烷二酮增敏剂
