[单选] When a marine surveyor is employed to assist in the move of a mobile offshore drilling unit，he（）.

A . becomes responsible for the safe movement of the rig
B . relieves the Offshore Installation Manager at the moment the rig is free from the bottom
C . must be designated as the person in charge of the rig
D . is a specialist who is hired to provide advice and guidance on aspects of the move

以下不是电子商务采用的安全技术的是（）。软件动态跟踪技术。数字签名。加密技术。安全电子交易规范。下列哪些原因使温带深水湖在春季出现生物生产力高峰：（）光照强度适宜。水生动物大量繁殖。水层中营养物质增加。水温升高。简述茎双穴吸虫病的症状。适度放牧的草场在不放牧之后将发生的现象是：（）植物竞争强度增加。植物竞争强度降低。植物种类增加。植物种类减少。出票行社对超过提示付款期但在票据权利时效内的银行本票，可（）。不予以受理。办理支付。办理退款。 When a marine surveyor is employed to assist in the move of a mobile offshore drilling unit，he（）.

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[单选] When a marine surveyor is employed to assist in the move of a mobile offshore drilling unit，he（）.

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