关于临床试验随机分组和隐蔽分组，以下哪一项是不正确的 A: 中心电话随机系统有助于成功地实施隐蔽分组（allocation concealment） B: 随机分组的成功必须借助隐蔽分组（allocation concealment） C: 隐蔽分组（allocation concealment）对非盲法的开放性（open-label）试验尤为重要 D: 组间基线（baseline characteristics）可比性随样本量的增加而增加 E: 半随机（quasi-randomization）的方法有助于开展隐蔽分组（allocation concealment）

It is recorded in Laozi: "Disaster is the avenue of fortune,And fortune is the concealment of disaster." This passage embodies Laozi's dialectical thought.( )

Which of the following doesn’t reflect Hanxu as concealment? A: the refusal on the part of poets to elaborate B: the reluctance on the part of painters to embellish C: the reservation on the part of garden designers or house designers for full exposure D: having meanings confined to the expressed words