The output from Listing 10 is 2 0 a a both x3 and x4 are null.

清单10的输出是2 0 a a both x3 and x4 are null。

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The pretreatment effect on X4 and ZCF57 wheat straw biochemical pulping was investigated.

研究了预处理对菌株x4、青霉zcf57麦草生物化学制浆的影响。

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There were obvious differences between X4/SI and R5/NSI viruses in env V3 loop sequences.

SI病毒和R5 /NSI病毒在V3环氨基酸序列方面，存在明显的区别。

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This system securely mounts a Mac mini inside a specially designed 1U enclosure, which also contains one PCIe 2.0 x4 slot, a 75W power supply plus a Thunderbolt daisy-chain port.

ENGADGET: Sonnet announces RackMac mini Xserver, makes Apple desktop IT life seem more legit

Reviewers agreed that its inclusion helped significantly improve single-threaded performance, to the point where the faster (in default clock speed) 3.4GHz Phenom II X4 965 was falling behind in benchmarks.

ENGADGET: AMD's 3.2GHz hexacore Phenom II X6 1090T comes out for a review roundup

The RackMac mini Xserver supports one half-length, x16 (x4 mode), PCIe 2.0 card to enable the use of professional video capture cards, 8Gb Fibre Channel cards, 10-Gigabit Ethernet cards, and RAID controller cards with a racked Mac mini all in 1U rack space.

ENGADGET: Sonnet announces RackMac mini Xserver, makes Apple desktop IT life seem more legit